php下载TXT文件

 //下载TXT文件
 //注意：这里不能用异步请求
 public function download(){
  $file_path = $this->request->get('file_path');
  $filename = ROOT_PATH.'public'.DIRECTORY_SEPARATOR.'uploads'.DIRECTORY_SEPARATOR.$file_path;
  //检测是否设置文件名和文件是否存在
  if ((isset($filename))&&(file_exists($filename))){
      header("Content-Type: application/force-download");
      header("Content-Disposition: attachment; filename=".basename($filename));
      readfile($filename);
  } else {
      echo "文件不存在!";
  }
}